Gemstone Information

Rocks & Co. - Experts in Gemstone Jewellery

Rocks & Co Gemstone Library

Beauty, rarity and durability - these are the attributes that make a gemstone. Discover fascinating gems at Rocks & Co., in our Gemstone Library you will learn everything you need to know about jewellery and gemstones. Learn more about your favourite gemstone, read about well-known gemstones such as Diamond, Emerald and Ruby and discover lesser known gems like Tanzanite, Tourmaline and Topaz. We explain the composition and characteristics of each gemstone plus information about the history and mythology surrounding individual gems. Learn what makes each gemstone unique and find which suits you best!

Under “General Information” you can read the basics about coloured gemstones. We explain the four C’s (Colour, Cut, Clarity and Carat Weight), and how to use these important criteria in evaluating gemstones. Learn how lustre, brilliance and fire make a gemstone so distinctive and read more detailed information on gemstone special effects such as Chatoyancy (cat’s eye effect), Adularescence (Opalescence) and colour change gemstones.

You can also find information regarding the precious metals we use, the different settings that suit each gemstone cut and jewellery wearing tips in the “About Jewellery” section. An important part of owning gemstone jewellery is knowing how to take care of it, learn the best ways to care for your gems, and their treatments, in our enhancement and care guide. Looking for a gift, but can’t decide which gemstone to give? We have compiled a list of birthstones, astrological gems, Chinese astrological gems and anniversary gems to help you decide on the perfect piece of jewellery! Immerse yourself in the world of gemstone jewellery!

December Birthstones: Tanzanite, Turquoise and Zircon

Birthstone for December: Tanzanite

The cool blue colour of the extremely rare tanzanite represents the cold winter month of December in a striking way. Its deep colour tones count amongst the most beautiful "velvety" blue tones in the world of gemstones.

Birthstone for December: Turquoise

Turquoise is a well-known gemstone with a long, rich history: The birthstone for December has been highly esteemed by some of the most influential cultures in the world from a very early date.

Birthstone for December: Zirconn

A further birthstone of the month December is Zircon - a gemstone with a diamond-like appearance, which often mistakenly gets confused with the synthetically manufactured Zirconia..

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